System X was set up thirty to forty years ago to do everything Room 641A was supposed to do without needing to be anywhere near the exchanges. They could just s

System X was set up thirty to forty years ago to do everything Room 641A was supposed to do without needing to be anywhere near the exchanges. They could just sit in London and put in the numbers to intercept and analogue signal processors looked out for various key words and important lines could be fully monitored